Measurement Computing USB-ERB24 - Manual (Page 21)

USB-ERB24 User's Guide Specifications
External power input
Table 3. External power input specifications
Parameter Conditions Specification
External power input +6.0 VDC to 12.5 VDC (9 VDC power
supply included).
6.0 V > V
ext
or V
ext
> 12.5 V PWR LED = Off (power fault) Voltage supervisor limits - PWR LED
(Note 1)
6.0 V < V
ext
< 12.5 V PWR LED = On
External power adapter (included) MCC p/n CB-PWR-9V3A +9 V ±10%, @ 3 A
Note 1: The USB-ERB24 monitors the external +9 V power supply voltage with a voltage supervisory
circuit. If this power supply exceeds its specified limit, the PWR LED will turn off indicating a
power fault condition.
External power output
Table 4. External power output specifications
Parameter Conditions Specification
External power output - current range 4.0 A max.
External power output (Note 2) Voltage drop between power input
and daisy chain power output 0.5 V max
Compatible cable(s) for daisy chain C-MAPWR-x x = 2 , 3 or 6 feet
Note 2: The daisy chain power output option allows multiple MCC USB Series products to be powered
from a single external power source in a daisy chain fashion. The voltage drop between the
module power supply input and the daisy chain output is 0.5 V max. Users must plan for this
drop to ensure the last module in the chain will receive at least 6.0 VDC.
USB specifications
Table 5. USB specifications
USB "B" connector Input
USB device type USB 2.0 (full-speed)
Device compatibility USB 1.1, USB 2.0
USB "A" connector Downstream hub output port
Supports USB 2.0 high-speed, full-speed and low-speed operating points
USB hub type
Self-powered, 100 mA max downstream VBUS capability
Compatible products MCC USB Series devices
USB cable type (upstream and
downstream) A-B cable, UL type AWM 2527 or equivalent. (min 24 AWG VBUS/GND, min
28 AWG D+/D-)
USB cable length 3 meters max.
4-2